On a Super User search page, link colors are set to this effect

.question-hyperlink {
  color: #1086a4;
}
.question-hyperlink:visited {
  color: #13b3bd;
}

Which equates out to a darker blue for links, and a lighter blue for visted links. Most sites I have come across over the years use the exact opposite convention; blue/lighter for links, purple/darker for visited links.

• HTML5 boilerplate
• Twitter Bootstrap
• even Stack Overflow

support this convention. What gives Super User?